if poolInfo.Decommission != nil {
		poolInfo.Decommission.TotalSize = pi.Total
		if poolInfo.Decommission.Failed || poolInfo.Decommission.Canceled {
			poolInfo.Decommission.CurrentSize = pi.Free
		} else {
			poolInfo.Decommission.CurrentSize = poolInfo.Decommission.StartSize + poolInfo.Decommission.BytesDone
		}
	} else {
		poolInfo.Decommission = &PoolDecommissionInfo{
			TotalSize:   pi.Total,

	nmeta1.Pools = append(nmeta1.Pools, meta.Pools...)
	for i, pool := range nmeta1.Pools {
		if i == 0 {
			nmeta1.Pools[i] = PoolStatus{
				CmdLine:    pool.CmdLine,
				ID:         i,
				LastUpdate: UTCNow(),
				Decommission: &PoolDecommissionInfo{
					Complete: true,
				},
			}
		}
	}

	var nmeta2 poolMeta
	nmeta2.Version = poolMetaVersion
	nmeta2.Pools = append(nmeta2.Pools, meta.Pools...)

				err = dc.ReadNil()
				if err != nil {
					err = msgp.WrapError(err, "Decommission")
					return
				}
				z.Decommission = nil
			} else {
				if z.Decommission == nil {
					z.Decommission = new(PoolDecommissionInfo)
				}
				err = z.Decommission.DecodeMsg(dc)
				if err != nil {
					err = msgp.WrapError(err, "Decommission")
					return
				}
			}
		default:
			err = dc.Skip()

	"github.com/minio/pkg/v2/env"
	"github.com/minio/pkg/v2/policy"
)

var (
	errRebalanceDecommissionAlreadyRunning = errors.New("Rebalance cannot be started, decommission is already in progress")
	errDecommissionRebalanceAlreadyRunning = errors.New("Decommission cannot be started, rebalance is already in progress")
)

func (a adminAPIHandlers) StartDecommission(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

			adminRouter.Methods(http.MethodGet).Path(adminVersion+"/pools/status").HandlerFunc(adminMiddleware(adminAPI.StatusPool, traceAllFlag)).Queries("pool", "{pool:.*}")

			adminRouter.Methods(http.MethodPost).Path(adminVersion+"/pools/decommission").HandlerFunc(adminMiddleware(adminAPI.StartDecommission, traceAllFlag)).Queries("pool", "{pool:.*}")

	poolMetaMutex sync.RWMutex
	poolMeta      poolMeta

	rebalMu   sync.RWMutex
	rebalMeta *rebalanceMeta

	deploymentID     [16]byte
	distributionAlgo string

	serverPools []*erasureSets

	// Active decommission canceler
	decommissionCancelers []context.CancelFunc

	s3Peer *S3PeerSys
}

func (z *erasureServerPools) SinglePool() bool {
	return len(z.serverPools) == 1
}

// Initialize new pool of erasure sets.

		}
		return
	}

	for _, arg := range args {
		if !ellipses.HasEllipses(arg) && len(args) > 1 {
			// TODO: support SNSD deployments to be decommissioned in future
			return fmt.Errorf("all args must have ellipses for pool expansion (%w) args: %s", errInvalidArgument, args)
		}
		setArgs, err = GetAllSets(setDriveCount, arg)
		if err != nil {
			return err
		}

							MTime:             version.ModTime,
							DeleteReplication: version.ReplicationState,
							DeleteMarker:      true, // make sure we create a delete marker
							SkipRebalancing:   true, // make sure we skip the decommissioned pool
							NoAuditLog:        true,
						})
					var failure bool
					if err != nil && !isErrObjectNotFound(err) && !isErrVersionNotFound(err) {
						rebalanceLogIf(ctx, err)
						failure = true
					}

	MaxParity bool

	// Provides a per object encryption function, allowing metadata encryption.
	EncryptFn objectMetaEncryptFn

	// SkipDecommissioned set to 'true' if the call requires skipping the pool being decommissioned.
	// mainly set for certain WRITE operations.
	SkipDecommissioned bool
	// SkipRebalancing should be set to 'true' if the call should skip pools